Polyimide film having denatured surface
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United States of America Patent
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Apr 8, 2003
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app pub date -
Aug 2, 2000
filing date -
Jan 28, 1998
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Abstract
A polyimide film of 20 to 125 .mu.m thick composed of aromatic polyimide prepared from an aromatic tetracarboxylic acid component (composed mainly of 3,4,3',4'-biphenyltetracarboxylic acid or its derivative) and an aromatic diamine component (composed mainly of p-phenyl-enediamine) and containing a micro-granular filler of metal atom-containing inorganic material, can be so denatured on its surfaces that an amount of the metal atom and a ratio of oxygen/carbon would increase by 0.03 to 1.0 atomic % and 0.01 to 0.20, respectively, on the processed surfaces, upon running in a gaseous mixture of argon and hydrogen between a plurality of activated plasma discharge electrodes arranged in a double line under such condition that the running polyimide film is free from contact with the electrodes.
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